| 摘要 |
The recopy paper guider in a cassette for a photocopy machine has the potential meter (3) which is a part of the brige circuit (4). The motor (1) in the cassette rotating to the directions of the forward or the backward according to the polarities generated by the operational amplifier (OP) which compares the voltage levels of VA and VB moves the paper guider where the potential meter (3) is attached. The position of the paper guider can be selected by just changing the resistance values (VR) in the brige circuit (3).
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